Module function_codes 

Modbus Function Codes Module

This module serves as the central definition point for all Modbus function codes supported by the stack. It categorizes function codes into two primary groups:

• public: Contains standard function codes defined by the Modbus Application Protocol Specification V1.1b3 (e.g., Read Coils, Write Holding Registers).
• user_defined: Provides a space for vendor-specific or proprietary function codes (ranges 65-72 and 100-110) as permitted by the standard.

Function codes are the core of the Modbus PDU, determining the action to be performed by the server. This module ensures that these codes are handled in a type-safe manner, providing conversions between raw bytes and structured enums.

This module is no_std compatible.

Modules

public

Standard Modbus function codes and their associated sub-functions.

user_defined

Extension point for non-standard, vendor-specific function codes. Special Function Codes Module